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Pulsus paradoxus

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pulsus paradoxus --> paradoxical pulse

An exaggeration of the normal variation in the pulse volume with respiration, becoming weaker with inspiration and stronger with expiration; characteristic of cardiac tamponade, rare in constrictive pericarditis; so called because these changes are independent of changes in the cardiac rate as measured directly or by electrocardiogram.

Synonym: pulsus paradoxus, pulsus respiratione intermittens.